Published February 1975
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Experimental proof of inelastic processes in the helium-solid-interface
Description
Monochromatic and tunable phonons (up to 870 GHz) were scattered from surfaces covered with helium films of various thicknesses. A strong phonon loss due to less than three atomic layers was observed which was independent of frequency. A frequency analysis of the scattered phonons showed that there are nonlinear processes in the surface layer. The results suggest a new approach to the understanding of the Kapitzaresistance. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Monochromatische und abstimmbare Phononen (bis 870 GHz) wurden an Festkoerperoberflaechen gestreut, die mit verschieden dicken Heliumfilmen bedeckt waren. Ein starker Verlust von Phononen unabhaengig von der Frequenz wurde schon bei duennen Filmen (< 3 Atomlagen) und niedrigen Heliumdruecken beobachtet. Eine Frequenzanalyse der gestreuten Phononen zeigt, dass in der Grenzschicht nichtlineare Prozesse stattfinden. Das weist in eine neue Richtung zum Verstaendnis des Problems des Kapitzawiderstands. (orig.)
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Additional details
Additional titles
- Original title (German)
- Experimenteller Nachweis inelastischer Prozesse in Helium-Festkoerper-Grenzschicht
Publishing Information
- Imprint Pagination
- 17 p.
- Report number
- Juel--1161
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 6202480
- Subject category
- S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; S71: CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS;
- Resource subtype / Literary indicator
- Thesis
- Descriptors DEI
- CRYSTALS; FILMS; FREQUENCY RANGE; GERMANIUM; HELIUM 4; INELASTIC SCATTERING; INTERFACES; KAPITZA RESISTANCE; LAYERS; PHONONS; PRESSURE DEPENDENCE; SOLIDS; SUPERFLUIDITY; SURFACES
- Descriptors DEC
- ELEMENTS; EVEN-EVEN NUCLEI; HELIUM ISOTOPES; ISOTOPES; LIGHT NUCLEI; METALS; NUCLEI; QUASI PARTICLES; SCATTERING; STABLE ISOTOPES; THERMAL BOUNDARY RESISTANCE
Optional Information
- Notes
- 9 figs.; 25 refs.